Quenched-tempered heat treatment method for bearing sleeve machining

Abstract

The invention aims to provide a quenched-tempered heat treatment method for bearing sleeve machining. The heat treatment method comprises the steps that (1) pre-heating treatment is carried out, specifically, a bearing sleeve used in the machining process is made from 20CrMnTi steel, the rough-machined bearing sleeve is preheated to 350 DEG C, and heat preservation is carried out for 30 minutes at a constant temperature; (2) normalizing heating is carried out on the bearing sleeve, specifically, the bearing sleeve which is pre-heated in the step 1 is further subjected to secondary heating to reach 800 DEG C; (3) quenching and cooling treatment is carried out, specifically, cold water is firstly sprayed on the surface of the high-temperature bearing sleeve to carry out cold water cooling, when the temperature of the bearing sleeve is decreased to 530 DEG C, water spraying is stopped, and then the bearing sleeve is immersed into oil for secondary cooling and then is placed in air to be air-cooled to 120 DEG C; and (4) high-temperature tempering treatment is carried out. The method has the advantages that the temperature reduction speed in the quenching process can be decreased, the temperature difference between inside and outside of the bearing sleeve can be reduced, the surface fracture in the quenching process can be avoided, the quenching quality can be improved, and the hardness and the surface wear resistance of the bearing sleeve can be improved.

Description

technical field [0001] The invention relates to the field of the processing technology of the bearing sleeve, in particular to the improvement of the heat treatment of the bearing sleeve, and in particular to a quenching and tempering heat treatment method for the processing of the bearing sleeve. Background technique [0002] With the improvement of the industrial level, the use of bearings is particularly widespread, especially the current bearing sleeves are subject to increasing requirements, so the requirements for the hardness of the bearing sleeves are relatively high, which requires the bearing sleeves. The internal structure is improved, but the currently used bearing sleeves generally have the disadvantages of low hardness and low wear resistance. In view of the continuous increase in the current work intensity, the hardness of the original bearing sleeves cannot meet the required hardness, resulting in The bearing sleeve is twisted and worn to a large extent durin...

AI Technical Summary

Problems solved by technology

[0002] With the improvement of the industrial level, the use of bearings is particularly widespread, especially the current bearing sleeves are subject to increasing requirements, so the requirements for the hardness of the bearing sleeves are relatively high, which requires the bearing sleeves. The internal structure is improved, but the currently used bearing sleeves generally have the disadvan